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Henry Gray (1825–1861).  Anatomy of the Human Body.  1918.
 


FIG. 1041– Superior and inferior duodenal fossæ. (Poirier and Charpy.) (See enlarged image)



FIG. 1042– Duodenojejunal fossa. (Poirier and Charpy.) (See enlarged image)

  1. Duodenal Fossæ (Figs. 1041, 1042).—Three are fairly constant, viz.: (a) The inferior duodenal fossa, present in from 70 to 75 per cent. of cases, is situated opposite the third lumbar vertebra on the left side of the ascending portion of the duodenum. Its opening is directed upward, and is bounded by a thin sharp fold of peritoneum with a concave margin, called the duodenomesocolic fold. The tip of the index finger introduced into the fossa under the fold passes some little distance behind the ascending portion of the duodenum. (b) The superior duodenal fossa, present in from 40 to 50 per cent. of cases, often coexists with the inferior one, and its orifice looks downward. It lies on the left of the ascending portion of the duodenum, in front of the second lumbar vertebra, and behind a sickle-shaped fold of peritoneum, the duodenojejunal fold, and has a depth of about 2 cm. (c) The duodenojejunal fossa exists in from 15 to 20 per cent. of cases, but has never yet been found in conjunction with the other forms of duodenal

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